Acid and waterproof cement and method of making the same.



106. COMPOSITIONS,

Examinel cross REFERENCE 1 I 23 7, 0 7

UNITED STATES PATENT OFFICE.

CURTIS C. MEIGS, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO ELECTRO- CHEMICAL SUPPLY &; ENGINEERING COMPANY, OF PHILADELPHIA, PENNSYL- VANIA, A CORPORATION OF PENNSYLVANIA.

COATING OR PLASl'C ACID AND WATERPROOF CEMENT AND METHOD OF MAKING THE SAME.

Patented Aug. 14, 1917. Application-filed November 6, 1916. Serial No. 129,750. /m I 7 7 1 237,078. Specification of Letters Patent.

. No Drawing.

My invention consists of afn alcid and water proof cement composed 0 si ica afiatite, and sodium silicate so treated that etcmen W en set, W1 1 be acid proof and msoluble in water.

I first mix together the silicious material such as or stalline silica, ground uafiz or tl le a atlte or ure calcium liose so 1um sillcat'e' all of %Eem the like,

hate and t eing, by preference, in a dry state. When the cement is to be used the dry mixture is moistened in the usual way and quickly becomes set. In most cases the mixture should be made in proportions of about ninety parts of silicious material, ten parts of apatite an t 1r y parts of sodium silicate.

Either before or a ter 1t ecomes set the mixture is subjected-to the action of an acid which will react upon the other components of the cement to render the same water roof. The acid which I prefer to use is sul in the presence of water, without losing any of its acid-proof qualities.

The acid may, if desired, be applied in the form of a coating to bodies of the silicacalcium phosphate-sodium silicate mixture after they have been molded or pressed into form.

I claim:

1. The mode herein described of producing a water and acid proof cement, said mode consisting in first mixing together silicious material and apatite, and then adding sodium silicate to said mixture.

2. The mode herein described of producing a water and acid proof cement, said mode consisting in first mixing together silicious material and apatite, then adding sodium silicate to said mixture, and then subjecting the compound to the action of an acid which will react with said apatite and sodium silicate to render the compound waterproof.

3. The mode herein described of producing a water and acid proof cement, said mode consisting in first mixing together silicious material and apatite, then adding sodium silicate to the mixture, and then subjecting the compound to the action of sulfuric acid. Y

4. A water and acid proof cement, com posed of silicious material, insoluble calcium sulfate, insoluble tertiary calcium and soric acid, which reacts upon the calcium p osp ate to produce hos horic acid fig; soluble calcium sulfate and primer; calcium filigsphate, the further reac 1on o t 0 sodium phosphates, and s1l1ca.

um s1 cate producing insoluble tert-a In testimony whereof, I have signed my calgiiuf and sodium phosEEates and smca name to this specification. "to u re emg a ar, ense O y y which is impenetrable, insoluble and inert I CURTIS C. LIEIGS. 

